1. Department of Biology, Georgetown University, Washington, District of Columbia, USA.
2. Department of Natural Resource Sciences, Faculty of Agricultural and Environmental Sciences, McGill University, Ste. Anne-de-Bellevue, Quebec, Canada.
3. Department of Ecology, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, Madrid, Spain.
4. Centro de Astrobiología (CAB, INTA-CSIC), Madrid, Spain.
5. School of Environmental Sciences, University of Guelph, Guelph, Ontario, Canada.